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For the past few days, the hot water in my bathroom sink has been coming out in a weak stream; last night, when I turned the fawcet knob open all the way, there was a horrible noise, like machine gun fire or something, and then the hot water came out on full blast. But then it wouldn’t shut off. Period. I was thinking I had air in the pipes and that was what caused the noise — but I don’t understand why the water won’t shut off (I had to turn off the main switch). Any ideas? I was thinking of just letting it run for a while, but don’t know if that will do anything or if I need a plumber. Thanks for any ideas…